Final answer:
The linear model of communication is a one-way communication flow where feedback is not taken into account. While this model is applicable to traditional media broadcasts, it is limited and contrasts with the interactive systems found in long-distance biological communication and the technical difficulties faced in SETI projects.
Step-by-step explanation:
The model of communication where a sender originates a message and sends it through a channel to a receiver, without taking any kind of feedback into consideration, is known as the linear model of communication. This model is characterized by its one-way communication flow and is often illustrated as a straight line from sender to receiver. In contrast to more interactive models, there is no mechanism for the receiver to respond or provide feedback to the sender. Examples include traditional mass media like television and radio broadcasts.
Regarding the long-distance communication systems in the human body, the nervous system and the endocrine system jointly facilitate the coordination of body functions. However, they differ significantly from the linear model, as they are capable of receiving feedback and adjusting accordingly. The search for extraterrestrial intelligence (SETI) invokes concepts of the linear communication model in its passive form, as humans attempt to intercept and interpret signals that may be broadcast from other civilizations. There's debate about whether we should send messages or focus on receiving them. The complexities of sending and receiving messages across the cosmos underscore the significant limitations and challenges inherent to one-way communication models, particularly regarding signal detection, channel selection, and message decoding.